Frost Dates for Tooele, UT
In Tooele, UT, the average last spring frost is around May 2 and the average first fall frost around Oct 16, for a growing season of about 165 days. For frost-tender plants, wait until May 28, when the chance of frost drops to 10%.
Based on NOAA 1991–2020 records from the Tooele, UT weather station, under 1 mile away, elevation 4,944 ft. Frost can come earlier in low spots and valleys and later near cities and large lakes.
Frost probability by date
Chance of a 32°F frost after the spring date, or before the fall date.
| Chance | Last spring frost | First fall frost |
|---|---|---|
| 10% | May 28 | Oct 2 |
| 20% | May 17 | Oct 7 |
| 30% | May 11 | Oct 11 |
| 40% | May 6 | Oct 14 |
| 50% | May 2 | Oct 16 |
| 60% | Apr 29 | Oct 19 |
| 70% | Apr 26 | Oct 22 |
| 80% | Apr 21 | Oct 27 |
| 90% | Apr 16 | Nov 2 |
Light frost vs. hard freeze
Average (50%) dates for each temperature. Tender plants are damaged at 36°F; most hardy crops survive until 28°F.
| Temperature | Last in spring | First in fall |
|---|---|---|
| Light frost (36°F) | May 16 | Oct 6 |
| Frost / freeze (32°F) | May 2 | Oct 16 |
| Hard freeze (28°F) | Apr 16 | Oct 27 |
Planting calendar for Tooele
Transplant May 9 – May 23
Transplant May 16 – May 30
Transplant May 16 – May 30
Transplant May 9 – May 23
Sow or transplant May 9 – May 23
Sow or transplant May 9 – May 23
Sow or transplant May 16 – May 30
Sow or transplant Apr 4 – Apr 18
Fall sowing Aug 21 – Sep 18
Fall sowing Aug 21 – Sep 11
Fall sowing Aug 7 – Aug 21
Sow or transplant Apr 4 – Apr 18
Fall sowing Aug 7 – Sep 4
Transplant Apr 18 – May 2
Fall sowing Jul 24 – Aug 7
Transplant Apr 11 – Apr 25
Fall sowing Jul 24 – Aug 7
Fall sowing Jul 24 – Aug 7
Fall sowing Sep 4 – Sep 25
Fall sowing Aug 7 – Aug 21
Plant Apr 4 – Apr 18
Based on the average last frost (May 2) and first frost (Oct 16). The dashed lines mark those dates. Seed packets list days to maturity; adjust for your varieties.